package jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

/**
 *
 */
public class Demo1 {
    public static void main(String[] args) throws Exception{
        /*
            使用JDBC链接数据库的大致步骤
            1:加载驱动(Class.forName)
            2:通过驱动管理器建立链接DriverManager.getConnection
            3:通过链接对象创建执行语句对象Statement
            4:通过Statement执行SQL语句
            5:如果执行的是查询语句，则遍历结果集ResulSet
            6:关闭链接
         */
        //1.加载驱动(每种数据库驱动的类名和包名都是固定的)
        //Class.forName("com.mysql.cj.jdbc.Driver");
        //2.
//        Connection connection = DriverManager.getConnection(
//                "jdbc:mysql://localhost:3306/tedu?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true",
//                "root","root");  //mysql是数据库名，改为tedu
//        System.out.println("与数据库建立链接");
        Connection connection = DBUtil.getConnection();
        //3.
        Statement statement = connection.createStatement();
        /*
            执行DDL语句
            创建一张表:
            CREATE TABLE user(
                id INT PRIMARY KEY AUTO_INCREMENT,
                username VARCHAR(32),
                password VARCHAR(32),
                nickname VARCHAR(32),
                age INT(3)
            )
         */
        String sql = "CREATE TABLE user(\n" +
                "                id INT PRIMARY KEY AUTO_INCREMENT,\n" +
                "                username VARCHAR(32),\n" +
                "                password VARCHAR(32),\n" +
                "                nickname VARCHAR(32),\n" +
                "                age INT(3)\n" +
                "            )";
        System.out.println(sql);
        /*
            execute()
         */
        statement.execute(sql);
        System.out.println("执行成功");
        connection.close();

    }
}
